94 GHz Over-Moded Traveling Wave Tube (TWT)
For my Ph.D. research, I am building a 94 GHz Over-moded Traveling Wave Tube Amplifier. The 94 GHz TWT is designed to operate with 30 dB of gain and 300 W peak power and will be one of the highest powered TWTs at that frequency. I have designed the vacuum system and am currently implementing the experiment. Details can be found in the publications below.
"Over-Moded W-band Traveling Wave Tube Design," E. Kowalski, M. Shapiro, and R. Temkin, IEEE 13th International Vacuum Electronics Conference. Pages 457-458. Apr. 2012.
"Design of an Over-Moded 94 GHz Coupled Cavity TWT," E. Kowalski, M. Shapiro, and R. Temkin, 36th International Conference on Infrared, Millimeter and Terahertz Waves. Oct. 2011.
"Over-Moded W-band Traveling Wave Tube Design," E. Kowalski, M. Shapiro, and R. Temkin, IEEE 13th International Vacuum Electronics Conference. Pages 457-458. Apr. 2012.
"Design of an Over-Moded 94 GHz Coupled Cavity TWT," E. Kowalski, M. Shapiro, and R. Temkin, 36th International Conference on Infrared, Millimeter and Terahertz Waves. Oct. 2011.
Overmoded Corrugated Transmission Lines
Along with my Ph.D. research, I research the losses and modes present in Over-moded corrugated waveguide transmission lines. These types of low-loss waveguides are used for high-frequency, high-power applications. This work particularly focuses on the waveguides that will be used in the ITER Electron Cyclotron Heating (ECH) transmission line system. The work has focussed on theory of waveguide losses and experimentally measuring low-losses in miter bends and polarizers.
"Linearly Polarized Modes in of a Corrugated Metallic Waveguide," E. J. Kowalski, D. S. Tax, M. A. Shapiro, J. R. Sirigiri, R. J. Temkin, T. S. Bigelow, D. A. Rasmussen, IEEE Trans. Microwave Theory and Techniques, Vol. 58, Issue 11, Part 1, pages 2772-2780 (Nov., 2010).
"Miter Bend Loss and Higher Order mode Content Measurements in Overmoded Millimter-wave Transmission Lines." E. J. Kowalski. Master of Science thesis at Massachusetts Institute of Technology. September, 2010.
"Linearly Polarized Modes in of a Corrugated Metallic Waveguide," E. J. Kowalski, D. S. Tax, M. A. Shapiro, J. R. Sirigiri, R. J. Temkin, T. S. Bigelow, D. A. Rasmussen, IEEE Trans. Microwave Theory and Techniques, Vol. 58, Issue 11, Part 1, pages 2772-2780 (Nov., 2010).
"Miter Bend Loss and Higher Order mode Content Measurements in Overmoded Millimter-wave Transmission Lines." E. J. Kowalski. Master of Science thesis at Massachusetts Institute of Technology. September, 2010.
| kowalski_ms_thesis.pdf |
Overmoded transmission line low-power loss measurements at 170 GHz
Undergraduate Work
"Efficient Corona Models in Spherical Geometry for Lightning Protection Applications." E. J. Kowalski. Bachelor of Science thesis for the Schreyer Honors College at Pennsylvania State University. August 2008
| kowalski_bs_thesis.pdf |
